US6137455A - Computer keyboard, mouse and VGA monitor signal transmission arrangement - Google Patents
Computer keyboard, mouse and VGA monitor signal transmission arrangement Download PDFInfo
- Publication number
- US6137455A US6137455A US09/177,966 US17796698A US6137455A US 6137455 A US6137455 A US 6137455A US 17796698 A US17796698 A US 17796698A US 6137455 A US6137455 A US 6137455A
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- United States
- Prior art keywords
- signals
- signal
- mouse
- keyboard
- video
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
Definitions
- the present invention relates to a computer keyboard, mouse and VGA monitor signal transmission arrangement which uses three VGA monitor video signal lines and one added signal line to achieve transmission of computer keyboard, mouse and VGA monitor signals to a remote place, enabling the user to operate the computer from a distance
- VGA monitor signals include red, blue, green, horizontal synchronizing, vertical synchronizing, ID . . . total 9 signals (13 signal lines); keyboard signals include CLOCK and DATA; mouse signals include CLOCK and DATA (serial mouse includes three signals, namely, TXD, RXD and RTS).
- the present invention has been accomplished to provide a computer keyboard, mouse and VGA monitor signal transmission arrangement which eliminates the aforesaid problems. It is one object of the present invention to provide a computer keyboard, mouse and VGA monitor signal transmission arrangement which uses three VGA video signal lines and one transmission signal line as means for transmission of computer keyboard, mouse and VGA monitor signals, enabling a computer user to operate a computer stably from a distance without causing any signal interference among keyboard signals, mouse signals and video signals. It is another object of the present invention to provide a computer keyboard, mouse and VGA monitor signal transmission arrangement which greatly minimizes the arrangement of electric cables and reduces the installation cost of the computer system.
- FIG. 1 is a schematic drawing explaining the transmission arrangement of the present invention.
- FIG. 2 illustrates the waveform of the horizontal signal from the VGA video port according to the present invention.
- FIG. 3 illustrates the waveform of the vertical signal from the VGA video port according to the present invention.
- FIG. 4 illustrates the waveform of the video signal from the VGA video port according to the present invention.
- FIG. 5 illustrates the waveform of the output signal from the G video operational amplifier of the encoder according to the present invention.
- FIG. 6 illustrates the waveform of the output signal from the R/B video operational amplifier according to the present invention.
- FIG. 7 is a circuit block diagram of the encoder according to the present invention.
- FIG. 8 is a circuit block diagram of the decoder according to the present invention.
- a computer keyboard, mouse and VGA monitor signal transmission arrangement in accordance with the present invention is generally comprised of an encoder 2, a set of signal lines 31 ⁇ 34, and a decoder 4.
- the input end of the encoder 2 is connected to the mainframe of a personal computer 10 to receive VGA monitor signals, keyboard signals and mouse signals from the personal computer 10 through a VGA monitor signal port 11, a keyboard signal port 12 and a mouse signal port 13, and to encode received VGA monitor signals, keyboard signals and mouse signals into a complex signal, and then to transmit the encoded complex signal to the input end of the decoder 4 through the red, green and blue signal lines 31 ⁇ 33.
- the decoder 4 receives and decodes the encoded complex signal from the encoder 2 through the signal lines 31 ⁇ 33, and then transmits the decoded VGA monitor signals, keyboard signals and mouse signals to a VGA monitor, a keyboard and a mouse through a VGA video port 51, a keyboard port 52 and a mouse port 53 respectively.
- the decoder 4 receives ID signals from the VGA video port 51, keyboard signals from the keyboard port 52 and mouse signals from the mouse port 53, then synthesizes received signals into a complex signal, and then transmits the synthesized complex signal through the D signal line 34 to the encoder 2.
- the encoder 2 Upon receipt of the complex signal from the decoder 4 through the D signal line 34, the encoder 2 immediately decodes the complex signal into corresponding VGA monitor signals, keyboard signals and mouse signals, and then transmits decoded VGA monitor signals, keyboard signals and mouse signals to the computer 10 through the VGA monitor signal port 11, the keyboard signal port 12 and the mouse signal port 13.
- the encoder 2 encodes VGA monitor signals (horizontal synchronizing signal, vertical synchronizing signal, red video signal, green video signal, blue video signal), keyboard signals (Data, Clock) and mouse signals (Data, Clock) from the personal computer 10, and is comprised of a logic gate 21, a parallel/serial converter 25, a single-chip microcomputer 26, and G.R.B video operational amplifiers 22 ⁇ 24.
- the logic gate 21 receives horizontal synchronizing signal (see FIG. 2) and vertical synchronizing signal (see FIG. 3) from VGA monitor signals, then synthesizes received horizontal synchronizing signal and vertical synchronizing signal into a complex signal, enabling the synthesized complex signal to be transmitted to the inverter terminal of the G video operational amplifier 23 and the input terminal of the parallel/serial converter 25.
- the parallel/serial converter 25 receives parallel output signal from the single-chip microcomputer 26 and clock signal from the logic gate 21, then converts received parallel data signal into corresponding serial data signal, enabling converted serial data signal to be transmitted to the inverter terminal of the B video operational amplifier 24.
- the non-inverter terminals of the R.G.B video operational amplifiers 22 ⁇ 24 receives red, green and blue video signals, and the signals at the output terminals of the R.G.B video operational amplifiers 22 ⁇ 24 are respectively transmitted through the red, green and blue signal lines 31 ⁇ 33 to the input end of the decoder 4 (see also FIG. 4).
- the video operational amplifiers 22 ⁇ 24 respectively amplify signals received from the respective non-inverter terminals, and then send amplified signals through the respective output terminals and the red, green and blue signal lines 31 ⁇ 33 to the non-inverter terminals of respective comparators 41 ⁇ 43 of the decoder 4 (see FIG. 8), and then to input terminals of respective amplifiers 46 ⁇ 48 of the decoder 4.
- the non-inverter terminals of the comparators 41 ⁇ 43 respectively receive a -0.4V voltage.
- the output terminals of the comparators 41 ⁇ 43 are connected to a +5V voltage through resistors R1,R2,R3 respectively.
- the waveform of the amplified output signal from the G video operational amplifier 23 is as shown in FIG. 5.
- the video signal in this waveform is of positive potential, and the horizontal synchronizing signal as well as the vertical synchronizing signal are of negative potential.
- the waveform of the amplified output signal from the R video operational amplifier 22/B video operational amplifier 24 is as shown
- the single chip microcomputer 26 receives and decodes keyboard signals from the keyboard signal port 12 and mouse signals from the mouse signal port 13, then transmits decoded signals to the parallel/serial converter 25 for converting into corresponding serial signals, enabling converted serial signals to be mixed with R video signal from the R operational amplifier 22 or B video signal from B operational amplifier 24.
- the waveform of the signal at this stage is as shown in FIG. 6, wherein negative voltage is represented by "1", and zero voltage is represented by "0".
- the single chip microcomputer 26 also receives signals from the D signal line 34, and then sends received VGA signals ID0 ⁇ ID3, keyboard signals and mouse signals to the personal computer 10 through the VGA monitor signal port 11, the keyboard signal port 12 and the mouse signal port 13.
- the decoder 4 is comprised of R.G.B comparators 41 ⁇ 43, a serial/parallel converter 44, a single chip microcomputer 45, a synchronizing separator circuit 49, and R.G.B amplifiers 46 ⁇ 48.
- the R.G.B comparators 41 ⁇ 43 receive complex signals transmitted from the encoder 2 through the red, green and blue signal lines 31 ⁇ 33.
- the green comparator 42 picks up horizontal synchronizing signal and vertical synchronizing signal from the green signal line 32 for providing the serial/parallel converter 44 with clock pulse.
- the red and blue comparators 41,43 separate digital signals from video signals, and send separated digital signals to the serial/parallel converter 44 for converting into parallel digital signals for the single chip microcomputer 45.
- the green comparator 42 also sends compared horizontal synchronizing signal and vertical synchronizing signal to the other input terminals of the R.G.B amplifiers 46 ⁇ 48 and the synchronizing separator circuit 49, enabling R.G.B video signals to be returned to their former waveform (see FIG. 4), and horizontal synchronizing signal to be separated from vertical synchronizing signal.
- the serial/parallel converter 44 receives the output signal of the G comparator 42, and converts serial data from the output signals of the R.B comparators 41,43 into parallel data, and then sends converted parallel data to the single chip microcomputer.
- the single chip microcomputer 45 receives and encodes ID0 ⁇ ID3 signals 70 of VGA video signal from the remote VGA video port 51, keyboard signals from the keyboard port 52 and mouse signals from the mouse port 53, then sends encoded signals through the D signal line 34 to the input terminal of the single chip microcomputer 26 of the encoder 2.
- the single chip microcomputer 45 also receives parallel data from the serial/parallel converter 44, then sends received data to the remote keyboard and mouse through the keyboard port 52 and the mouse port 53.
- the input terminals of the R.G.B amplifiers 46 ⁇ 48 receive complex signals from the encoder 2 through the R.G.B signal lines 31 ⁇ 33 and the output signal of the G comparator 42.
- the R.G.B amplifiers 46 ⁇ 48 remove horizontal synchronizing signal, vertical synchronizing signal and digital signal from the received signals to be removed from inputted signals, so as to reduce input signals to output red, green and blue video signals (see FIG. 4), enabling reduced red, green and blue video signals to be sent to the VGA monitor through the VGA video port 51.
- the synchronizing separator circuit 49 receives horizontal synchronizing signal and vertical synchronizing signal, then separates received horizontal synchronizing signal from vertical synchronizing signal (see FIGS. 2 and 3), and then picks up separated horizontal synchronizing signal from vertical synchronizing signal, and then sends picked up signals to the VGA monitor through the VGA video port 51.
- the invention simply uses VGA monitor's three one-way transmission video signal lines and one one-way transmission signal line to transmit two-way computer keyboard and mouse signals and one-way VGA monitor signals to remote apparatus, enabling the user to operate the computer from a distance.
- horizontal or vertical synchronizing pulse can be negative pulse or positive pulse
- the mouse used can be a RS-232 mouse
- the remote apparatus may include any other serial/parallel peripheral apparatus.
Abstract
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US09/177,966 US6137455A (en) | 1998-10-26 | 1998-10-26 | Computer keyboard, mouse and VGA monitor signal transmission arrangement |
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US09/177,966 US6137455A (en) | 1998-10-26 | 1998-10-26 | Computer keyboard, mouse and VGA monitor signal transmission arrangement |
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US09/177,966 Expired - Lifetime US6137455A (en) | 1998-10-26 | 1998-10-26 | Computer keyboard, mouse and VGA monitor signal transmission arrangement |
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Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020143996A1 (en) * | 2001-03-29 | 2002-10-03 | Vic Odryna | Passive video multiplexing method and apparatus priority to prior provisional application |
US20030099190A1 (en) * | 2001-11-16 | 2003-05-29 | Zerbe Jared L. | Signal line routing to reduce crosstalk effects |
US20040059782A1 (en) * | 2002-09-20 | 2004-03-25 | American Megatrends, Inc. | Systems and methods for establishing interaction between a local computer and a remote computer |
US20040190773A1 (en) * | 2003-03-31 | 2004-09-30 | American Megatrends, Inc. | Method, apparatus, and computer-readable medium for identifying character coordinates |
US20040243883A1 (en) * | 2003-05-27 | 2004-12-02 | American Megatrends, Inc. | Method and system for remote software debugging |
US20040255276A1 (en) * | 2003-06-16 | 2004-12-16 | Gene Rovang | Method and system for remote software testing |
US20050044184A1 (en) * | 2000-05-03 | 2005-02-24 | Thomas Christopher L. | Network based KVM switching system |
US20050046637A1 (en) * | 2001-12-10 | 2005-03-03 | American Megatrends, Inc. | Systems and methods for capturing screen displays from a host computing system for display at a remote terminal |
US20050049584A1 (en) * | 2001-02-02 | 2005-03-03 | Lumineyes, Llc | Techniques for alteration of iris pigment |
US20050246433A1 (en) * | 2004-01-09 | 2005-11-03 | Carrigan Brian J | Method and apparatus for facilitating control of a target computer by a remote computer |
US6999516B1 (en) * | 2001-10-24 | 2006-02-14 | Rambus Inc. | Technique for emulating differential signaling |
US20060222081A1 (en) * | 2005-04-01 | 2006-10-05 | Digital Multitools, Inc. | Method for reducing noise and jitter effects in KVM systems |
US20060250319A1 (en) * | 2005-05-06 | 2006-11-09 | Ooi Sooliam L | Antenna apparatus and method of forming same |
US7142612B2 (en) | 2001-11-16 | 2006-11-28 | Rambus, Inc. | Method and apparatus for multi-level signaling |
US20070009018A1 (en) * | 2005-06-02 | 2007-01-11 | Yuanlong Wang | Signaling system |
US20070136621A1 (en) * | 2005-12-09 | 2007-06-14 | Elad Alon | Transmitter with skew reduction |
US20070132485A1 (en) * | 2005-12-09 | 2007-06-14 | Elad Alon | Four-wire signaling system |
US20070164883A1 (en) * | 2003-10-22 | 2007-07-19 | Koninklijke Philips Electronics N.V. | Method and device for transmitting data over a plurality of transmission lines |
US20070168746A1 (en) * | 2005-12-14 | 2007-07-19 | Stefano Righi | System and method for debugging a target computer using SMBus |
US20070174526A1 (en) * | 2005-04-29 | 2007-07-26 | Avocent Corporation | Virtual media systems, methods and devices |
US20080122784A1 (en) * | 2006-11-08 | 2008-05-29 | Aten International Co., Ltd. | Communicating system and method thereof |
US7519749B1 (en) | 2004-08-25 | 2009-04-14 | American Megatrends, Inc. | Redirecting input and output for multiple computers |
US7543277B1 (en) | 2003-06-27 | 2009-06-02 | American Megatrends, Inc. | Method and system for remote software debugging |
US7546374B2 (en) | 2005-08-05 | 2009-06-09 | Global Serv Inc. | Methods and arrangements for managing and maintaining a switch environment |
US20100023660A1 (en) * | 2008-07-25 | 2010-01-28 | Aten International Co., Ltd. | Kvm system |
US7689704B2 (en) | 2005-08-05 | 2010-03-30 | Global Serv Inc. | Methods and arrangements for managing automated switching |
US7783799B1 (en) | 2006-08-31 | 2010-08-24 | American Megatrends, Inc. | Remotely controllable switch and testing methods using same |
US7827258B1 (en) | 2004-03-01 | 2010-11-02 | American Megatrends, Inc. | Method, system, and apparatus for communicating with a computer management device |
US20110072175A1 (en) * | 2003-09-18 | 2011-03-24 | Yee Liaw | Multimedia-capable computer management system for selectively operating a plurality of computers |
CN102075770A (en) * | 2011-01-05 | 2011-05-25 | 南京邮电大学 | Automatic color correction method and device for video graphics array (VGA) video extended signal |
US8009173B2 (en) | 2006-08-10 | 2011-08-30 | Avocent Huntsville Corporation | Rack interface pod with intelligent platform control |
US8269783B2 (en) | 1999-08-25 | 2012-09-18 | Avocent Redmond Corporation | KVM switch including a terminal emulator |
US20130036248A1 (en) * | 2011-08-04 | 2013-02-07 | Hon Hai Precision Industry Co., Ltd. | Monitor with personal system/2 keyboard interface |
US8427489B2 (en) | 2006-08-10 | 2013-04-23 | Avocent Huntsville Corporation | Rack interface pod with intelligent platform control |
CN111158501A (en) * | 2019-12-18 | 2020-05-15 | 武汉兴图新科电子股份有限公司 | Video monitoring system based on KVM |
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Cited By (78)
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US20050044184A1 (en) * | 2000-05-03 | 2005-02-24 | Thomas Christopher L. | Network based KVM switching system |
US20050049584A1 (en) * | 2001-02-02 | 2005-03-03 | Lumineyes, Llc | Techniques for alteration of iris pigment |
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US7142612B2 (en) | 2001-11-16 | 2006-11-28 | Rambus, Inc. | Method and apparatus for multi-level signaling |
US20050046637A1 (en) * | 2001-12-10 | 2005-03-03 | American Megatrends, Inc. | Systems and methods for capturing screen displays from a host computing system for display at a remote terminal |
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US20060222081A1 (en) * | 2005-04-01 | 2006-10-05 | Digital Multitools, Inc. | Method for reducing noise and jitter effects in KVM systems |
US7640382B2 (en) | 2005-04-29 | 2009-12-29 | Avocent Corporation | Virtual media systems, methods and devices |
US9398072B2 (en) | 2005-04-29 | 2016-07-19 | Avocent Corporation | Virtual media systems, methods and devices |
US20100077118A1 (en) * | 2005-04-29 | 2010-03-25 | Steven Blackwell | Virtual Media Systems, Methods and Devices |
US20100057956A1 (en) * | 2005-04-29 | 2010-03-04 | Steven Blackwell | Virtual Media Systems, Methods and Devices |
US20070174526A1 (en) * | 2005-04-29 | 2007-07-26 | Avocent Corporation | Virtual media systems, methods and devices |
US20060250319A1 (en) * | 2005-05-06 | 2006-11-09 | Ooi Sooliam L | Antenna apparatus and method of forming same |
US7656321B2 (en) | 2005-06-02 | 2010-02-02 | Rambus Inc. | Signaling system |
US20070009018A1 (en) * | 2005-06-02 | 2007-01-11 | Yuanlong Wang | Signaling system |
US7546374B2 (en) | 2005-08-05 | 2009-06-09 | Global Serv Inc. | Methods and arrangements for managing and maintaining a switch environment |
US7689704B2 (en) | 2005-08-05 | 2010-03-30 | Global Serv Inc. | Methods and arrangements for managing automated switching |
US7650526B2 (en) | 2005-12-09 | 2010-01-19 | Rambus Inc. | Transmitter with skew reduction |
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